Experimental study of tube-wall temperature measurements in CFB boilers by embedding thermocouples using deposited metal

doi:10.16511/j.cnki.qhdxxb.2019.21.001

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Journal of Tsinghua University(Science and Technology) ›› 2019, Vol. 59 ›› Issue (4) : 326-330. DOI: 10.16511/j.cnki.qhdxxb.2019.21.001

THERMAL ENGINEERING

Experimental study of tube-wall temperature measurements in CFB boilers by embedding thermocouples using deposited metal

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Abstract

Heating surface tube-wall temperatures are key parameters for boiler safety. The high solids concentration in circulating fluidized bed (CFB) boilers complicates installation of thermocouples in the furnace or the fluidized bed heat exchanger. This paper describes a method for embedding thermocouples using deposited metal to measure the tube-wall temperatures in CFB boilers. The method was evaluated experimentally with two deposition shapes with the heat transfer between the thermocouple and the tube-wall analyzed to calculate the actual tube-wall temperature without the deposited metal. The results show that the differences between the measured and actual temperatures of the tube-wall without the deposited metal for the two deposition shapes were about ±3℃ and ±7℃ for various working conditions. Thus, this method can be applied to measure tube-wall temperatures in CFB boilers.

Key words

tube-wall temperature / thermocouple / deposited metal / circulating fluidized bed boiler

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YAO Yuge, LÜ Junfu, ZHANG Yang, CHEN Shujie, ZHANG Man, YANG Hairui. Experimental study of tube-wall temperature measurements in CFB boilers by embedding thermocouples using deposited metal[J]. Journal of Tsinghua University(Science and Technology). 2019, 59(4): 326-330 https://doi.org/10.16511/j.cnki.qhdxxb.2019.21.001

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